CN112729482A - Automatic verification system for oiling machine - Google Patents

Automatic verification system for oiling machine Download PDF

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Publication number
CN112729482A
CN112729482A CN202011521617.XA CN202011521617A CN112729482A CN 112729482 A CN112729482 A CN 112729482A CN 202011521617 A CN202011521617 A CN 202011521617A CN 112729482 A CN112729482 A CN 112729482A
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CN
China
Prior art keywords
oil
quantitative detection
oiling machine
verification system
liquid level
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Pending
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CN202011521617.XA
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Chinese (zh)
Inventor
卜祥强
姚强
张妤
徐珂
常勇
谢小辉
孙明星
周韶波
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Ganzhou Jiuchuang Technology Co ltd
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Ganzhou Jiuchuang Technology Co ltd
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Application filed by Ganzhou Jiuchuang Technology Co ltd filed Critical Ganzhou Jiuchuang Technology Co ltd
Priority to CN202011521617.XA priority Critical patent/CN112729482A/en
Publication of CN112729482A publication Critical patent/CN112729482A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/20Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00Thermometers specially adapted for specific purposes
    • G01K13/02Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow

Abstract

An automatic verification system for an oiling machine comprises an oil storage device and a handheld display device, wherein the oil storage device consists of an oil inlet box positioned at the upper part, an oil passing pipe positioned at the middle part and a quantitative detection box positioned at the lower part; this scheme adopts oil storage device and handheld display device to accomplish above-mentioned tanker aircraft examination operation, moreover, set up quantitative detector and temperature sensor in the oil storage device, handheld display device can real-time reception data and storage, automated control has been realized, automated computation procedure, not only the measuring accuracy has been strengthened, but also can directly read current indicating value, the current relative error of this tanker aircraft from control mechanism's display screen, the manpower has been saved, material resources, improve the accuracy, promote the convenience.

Description

Automatic verification system for oiling machine
Technical Field
The invention relates to the technical field of verification of oiling machines, in particular to an automatic verification system for an oiling machine.
Background
As is known, the verification of the oiling machine is the important factor in the daily quality management work of petroleum sales enterprises, because the gas station is the window of the sales enterprises, the gas station directly faces vast petroleum consumers, the acceptance of the consumers on the oil product payment directly influences the credit and image of the sales enterprises, the accuracy of the oiling machine oil consumption determines the cognition of the public on the petroleum enterprises, and also determines the vital interests of the enterprises. Therefore, the oil sales enterprises all use the certification of the fuel dispensers as a daily and necessary special work.
At present, a practical tool adopted by the traditional oiling machine verification is a standard metal measuring device for manually verifying the oil delivery amount of the oiling machine. The assay is now performed using a measuring device with a capacity of 20 liters or more, and the specific assay method is as follows:
1. firstly, a measuring device with the volume of more than 20L is soaked, namely, about 20L of oiling machine media (gasoline or diesel oil) are injected into the measuring device, and then two persons are required to lift and transport the oil to a tank of a gas station to return the oil to the tank.
2. Quantitative detection: and placing the soaked measuring device beside the tested oiling machine, setting a fixed value of 20L on a keyboard of the oiling machine by one person, starting to fill gasoline or diesel into the measuring device, and manually recording the temperature t1 by another person holding a mercury thermometer to measure the oil temperature at an oil outlet of the oil gun.
3. When the 20L of fuel dispenser is finished, the oil volume Vt in the measuring device is calculated manually by reading the calipers on the measuring device manually, the temperature t2 in the tank body is measured manually by using a mercury thermometer again, and then the Vt is converted into the standard volume V20 at 20 ℃ by using a formula.
4. And calculating the error thousandth ratio between the actual oil delivery amount of the oiling machine and the set value of the oiling machine under the constant value verification by using a formula again to obtain the relative error of the oiling machine.
Repeating the steps for 2-4 times, taking the average value of three times to obtain the final relative error average value, and finally writing the file for future reference.
The traditional operation method has the following disadvantages:
1. all the operations with extremely low efficiency are completed by manual carrying, manual observation, manual calculation and manual writing of files, and the verification time of one gun of each oiling machine needs at least 1 hour.
2. Need personnel many, when personnel intensity of labour examines greatly, need two at least people to carry the measuring apparatus more than 20L (about 20 kilograms), the stroke of transport is longer moreover, because the tanker aircraft of every filling station can not be less than 50 meters apart from the ground jar, a rifle uses this measuring apparatus 3 ~ 4 times at least, corresponding transport needs 6 ~ 8 times, and it can be imagined that two people are carrying 6 ~ 8 times intensity of labour of walking of the object of weighing up to 20 kilograms. During the measurement, hold the rifle alone and refuel, still need observe liquid level and temperature alone, wasted a large amount of manpower resources.
3. The accuracy of the verification numerical value is poor according to the requirements of JJG443-2015 'fuel dispenser verification regulation', and the repeatability error of the verification is not more than three thousandths. The repeatability can be achieved only when the following conditions are met: the same operator, the same measurement system, the same operating conditions, the same subject, and the repeated measurement of the subject in a short time. Then the following conditions need to be satisfied for the actual operation of the fuel dispenser to achieve objective and accurate measurement: same flow point, same standard, same time period, same person operation, same operation mode, same refueling mode (quantitative or non-quantitative), same titration time. Meanwhile, the operator is required to carefully and accurately read the indication value, strictly and accurately calculate the indication value and comprehensively and accurately fill the record and the file. However, the actual operation is manually completed, and the accuracy of the final result is determined by the subjective awareness and the operation ability of each person.
4. The oil product volatilizes in the calibration process of the oiling machine with great potential safety hazard in the operation, the formed oil gas has great danger, and accidents can be caused by slight misoperation or other factors. The operator carries a measuring device which is filled with more than 20 kilograms of oil products, and measures the temperature at an oil gun mouth by a rod type thermometer in an exposed environment, so that the oil products can splash and even fall on the ground if the operator is improper slightly, and serious potential safety hazards exist.
5. The operation engineering is complicated, and like the above, if the strict verification work is completed by manual operation, the verification of only one gun is circulated for dozens of times from preparation to oil product recharging, to data reading, to data recording, data calculation and verification data archiving. Each fuel dispenser has at least two guns per station, so a station may take at least several days if the certification is complete. And according to the requirements of oil product sales enterprises, the oiling machine needs to be self-checked every month, and the heavy work troubles each enterprise.
Therefore, the existing method for calibrating the fuel dispenser has great inconvenience and defects, and further improvement is needed. How to create a new automatic calibrating instrument for the oiling machine, which overcomes the defects of the existing manual operation, realizes the automatic calibration of the oiling machine with intellectualization, simplification and accuracy, and becomes the target of great improvement in the current industry.
Disclosure of Invention
In order to solve the technical problems, the invention provides an automatic verification system for an oiling machine, which overcomes various defects of the existing manual verification method and realizes intelligent, simplified and accurate automatic verification of the oiling machine.
The technical scheme adopted by the invention is as follows: an automatic verification system for an oiling machine comprises an oil storage device and a handheld display device, wherein the oil storage device consists of an oil inlet box positioned at the upper part, an oil passing pipe positioned at the middle part and a quantitative detection box positioned at the lower part;
the oil inlet box is an independent box body structure with an inner cavity, an oil gun fixing port is arranged on one side of the oil inlet box, a flow guide mechanism for guiding oil discharged by an oil gun to an oil pipe is arranged in the cavity of the oil inlet box, and a temperature sensor for detecting the temperature of the oil is arranged on the flow guide mechanism;
the oil pipe is of a tubular structure, and a plurality of groups of air hammers are arranged on the outer wall of the tubular structure;
the quantitative detection box is of an independent box body structure with an inner cavity, an oil discharge pipe with a stop valve is arranged at the bottom of the quantitative detection box, a visual liquid level meter is arranged on one side of the quantitative detection box, a liquid level transmission mechanism is arranged on the other side of the quantitative detection box, the liquid level transmission mechanism comprises at least two diaphragm flanges which are arranged on the side wall of the quantitative detection box at a certain interval, the diaphragm flanges are respectively communicated with the inner cavity of the quantitative detection box, and each diaphragm flange is respectively connected with a liquid level transmitter through an independent capillary tube;
the handheld display device is respectively connected with the temperature sensor, the air hammer and the liquid level transmitter through connecting wires.
Further optimize, advance oil tank, cross oil pipe and quantitative detection case for integrated structure shaping.
Further optimize, the water conservancy diversion mechanism for setting up the arc guide plate in advancing the oil tank, the direction of buckling of arc guide plate is towards the leakage fluid dram of oil gun.
Further optimize, the arc guide plate on be equipped with the fixed slot that is used for installing temperature sensor the port department of fixed slot is equipped with the shrouding that is used for encapsulating temperature sensor in the fixed slot.
Further preferably, the sealing plate is a plate-shaped member made of a heat conducting material.
Further optimize, the oil extraction pipe on still be equipped with the oil pump that is used for taking the fluid in the quantitative determination case to the assigned position.
Further preferably, 2-4 groups of air hammers are arranged on the outer wall of the oil passing pipe at intervals.
Further optimize, liquid level transport mechanism be equipped with three interval same height's diaphragm flange, each diaphragm flange all is through independent capillary connection liquid level changer.
The invention has the beneficial effects that:
one of them, this scheme is through optimizing, adopt oil storage device and handheld display device to accomplish above-mentioned tanker aircraft examination operation, moreover, set up quantitative detection appearance and temperature sensor in the oil storage device, handheld display device can real-time reception data and save, automated control has been realized, automatic calculation procedure, not only strengthened measuring accuracy, but also can directly read the current indicating value of this tanker aircraft from control mechanism's display screen, current relative error, the manpower has been saved, material resources, the accuracy is improved, promote the convenience.
In the second scheme, the flow guide mechanism for guiding oil discharged by the oil gun to the oil pipe is arranged at the oil injection port of the oil inlet box, the temperature sensor for detecting the temperature of the oil is arranged on the flow guide mechanism, the temperature of the oil is automatically acquired at the injection port, and the measurement accuracy is improved.
The liquid level transmission mechanism comprises at least two diaphragm flanges which are arranged on the side wall of the quantitative detection box at a certain height, the diaphragm flanges are respectively communicated with the inner cavity of the quantitative detection box, and each diaphragm flange is respectively connected with a liquid level transmitter through an independent capillary tube, so that the accuracy of quantitative detection is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a sectional view showing the structure of an oil feed tank in the present invention.
FIG. 3 is a schematic structural diagram of a quantitative determination box according to the present invention, which is provided with three sets of diaphragm flanges.
The labels in the figure are: 1. the oil storage device comprises an oil storage device 2, a handheld display device 3, a fuel filling gun 10, an oil inlet box 11, an oil cavity fixing port 12, a flow guide mechanism 13, a temperature sensor 20, a fuel passing pipe 21, an air hammer 30, a quantitative detection box 31, a fuel discharging pipe 32, a stop valve 33, a visual liquid level meter 34, a diaphragm flange 35, a capillary pipe 36, a liquid level transmitter 37 and an oil pump.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" and "an" or "the" and similar referents in the description and claims of the present invention also do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. The word "comprise" or "comprises", and the like, indicates that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, but does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships or positional relationships in a certain state, and when the absolute position of the object to be described is changed or the usage state is changed, the relative positional relationships may also be changed accordingly.
The following detailed description is made in conjunction with the accompanying drawings, and as shown in fig. 1-2, an automatic verification system for a refueling machine comprises an oil storage device 1 and a handheld display device 2, wherein a quantitative detector and a temperature sensor are arranged in the oil storage device 1, and the handheld display device 2 can receive and store data in real time, so that an automatic control and automatic calculation program is realized, the measurement accuracy is enhanced, and the current indication value and the current relative error of the refueling machine can be directly read from a display screen of a control mechanism, so that the manpower and material resources are saved, the accuracy is improved, and the convenience is improved;
as shown in the figure, the oil storage device 1 consists of an oil inlet tank 10 positioned at the upper part, an oil passing pipe 20 positioned at the middle part and a lower quantitative detection tank 30 positioned at the lower part;
the oil inlet box 10 is an independent box structure with an inner cavity, an oil gun fixing port 11 is arranged on one side of the oil inlet box, an oil gun 3 connected with an oiling machine can be inserted into the oil gun fixing port 11 and fixed, then the oil filling amount can be set, a flow guide mechanism 12 for guiding oil discharged by the oil gun to the oil pipe is arranged in the cavity of the oil inlet box, a temperature sensor 13 for detecting the temperature of the oil is arranged on the flow guide mechanism, and what needs to be described is that: the purpose of the flow guide mechanism is as follows: for guiding the oil discharged from the oil gun into the oil pipe, the skilled person can therefore make appropriate designs for the mechanism according to the above understanding, for example: the bent direction of the arc-shaped guide plate faces to a liquid outlet of the oil gun;
the oil pipe 20 is of a tubular structure, a plurality of groups of air hammers 21 are arranged on the outer wall of the tubular structure, and in consideration of the adhesion property of oil, in order to prevent the oil from adhering to the pipe wall of the oil pipe 20, the air hammers 21 can be adopted to hammer the pipe cavity wall so that the oil falls into a quantitative detection box, and the detection accuracy is improved;
the quantitative detection box 30 is an independent box structure with an inner cavity, the bottom of the quantitative detection box is provided with an oil discharge pipe 31 with a stop valve 32, one side of the quantitative detection box is provided with a visible liquid level meter 33, the other side of the quantitative detection box is provided with a liquid level transmission mechanism, the liquid level transmission mechanism comprises at least two diaphragm flanges 34 which are arranged on the side wall of the quantitative detection box at a certain interval, the diaphragm flanges 34 are respectively communicated with the inner cavity of the quantitative detection box, and each diaphragm flange is respectively connected with a liquid level transmitter 36 through an independent capillary 35;
it should be noted that: adopt the higher improved generation's of control accuracy double flange liquid level transmitter in this scheme, can effectively shield the interference of pressure variation to the liquid level in the quantitative determination case, the sensor of diaphragm formula is diaphragm flange promptly and comes the conducted signal through special medium in diaphragm and the capillary and make the changer keep apart the measured medium completely, improves and measures the accuracy.
The handheld display device 2 is respectively connected with the temperature sensor, the air hammer and the liquid level transmitter through connecting wires and used for receiving signals in real time and outputting control instructions.
In this scheme, the oil inlet box 10, the oil pipe 20 and the quantitative detection box 30 are formed as an integrated structure.
In the scheme, when the temperature sensor is installed, a fixing groove for installing the temperature sensor can be arranged on the arc-shaped guide plate, and a sealing plate for packaging the temperature sensor in the fixing groove is arranged at the port of the fixing groove; the sealing plate is a plate-shaped component made of heat conducting materials.
In this scheme, after the quantitative determination, for the convenience of oil extraction, can also be in the oil extraction pipe on set up and be used for taking the fluid in the quantitative determination case out to the oil pump of assigned position.
In the scheme, 2-4 groups of air hammers are arranged on the outer wall of the oil passing pipe at intervals.
In order to improve the quantitative detection effect, the liquid level transmission mechanism can be further provided with three membrane flanges 34, the interval between every two membrane flanges 34 is the same in height, each membrane flange is connected with a liquid level transmitter 36 through an independent capillary 35, as shown in fig. 3, a program can be set in advance, a visual signal lamp is determined in a handheld display device corresponding to each liquid level data, when quantitative oil filling is carried out, each membrane flange 34 transmits the liquid level data, the handheld display device can be provided with a signal lamp to flash, and the liquid level transmission mechanism can be used for workers to effectively compare data.
This scheme uses the case of examining 20L oil of tanker aircraft filling, treats examining the tanker aircraft and carries out the ration, and concrete examination step is:
1. the system is moved to the position near the oiling machine to be detected, the oiling gun is stably placed, the oiling gun is inserted into the oil gun fixing port and fixed, and a worker holds the display device by hand;
2. inputting in an address bar of a display screen of a handheld display device: the name of the refueling station, the serial number of the refueling machine and the gun number of the refueling gun, and at the moment, the specific refueling gun to be detected is memorized and stored.
3. 20L is set on a keyboard of the oiling machine, then oil products are injected into the oil storage device for infiltration, and then the oil products are returned to the tank.
4. And (4) filling 20L of oil into the oil storage device, and hanging a gun. Whether oil foam disappears in the oil storage bin can be observed through the liquid injection port, and the metering on the handheld display device is clicked, so that the oil foam can be detected as required: temperature, density, volume, relative error, etc.
5. And repeating the measurement according to the steps to obtain the average value of all required data until all the oil guns are detected.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. The utility model provides an automatic verification system for oiling machine which characterized in that:
the oil storage device consists of an oil inlet tank positioned at the upper part, an oil passing pipe positioned at the middle part and a quantitative detection tank positioned at the lower part;
the oil inlet box is an independent box body structure with an inner cavity, an oil gun fixing port is arranged on one side of the oil inlet box, a flow guide mechanism for guiding oil discharged by an oil gun to an oil pipe is arranged in the cavity of the oil inlet box, and a temperature sensor for detecting the temperature of the oil is arranged on the flow guide mechanism;
the oil pipe is of a tubular structure, and a plurality of groups of air hammers are arranged on the outer wall of the tubular structure;
the quantitative detection box is of an independent box body structure with an inner cavity, an oil discharge pipe with a stop valve is arranged at the bottom of the quantitative detection box, a visual liquid level meter is arranged on one side of the quantitative detection box, a liquid level transmission mechanism is arranged on the other side of the quantitative detection box, the liquid level transmission mechanism comprises at least two diaphragm flanges which are arranged on the side wall of the quantitative detection box at a certain interval, the diaphragm flanges are respectively communicated with the inner cavity of the quantitative detection box, and each diaphragm flange is respectively connected with a liquid level transmitter through an independent capillary tube;
the handheld display device is respectively connected with the temperature sensor, the air hammer and the liquid level transmitter through connecting wires.
2. The automatic verification system for the oiling machine according to claim 1, wherein: the oil inlet box, the oil passing pipe and the quantitative detection box are integrally formed.
3. The automatic verification system for the oiling machine according to claim 1, wherein: the flow guide mechanism is an arc-shaped flow guide plate arranged in the oil inlet box, and the bending direction of the arc-shaped flow guide plate faces to the liquid outlet of the oil gun.
4. The automatic verification system for the oiling machine according to claim 3, wherein: arc guide plate on be equipped with the fixed slot that is used for installing temperature sensor the port department of fixed slot is equipped with the shrouding that is used for encapsulating temperature sensor in the fixed slot.
5. The automatic verification system for the oiling machine according to claim 4, wherein: the sealing plate is a plate-shaped component made of heat conducting materials.
6. The automatic verification system for the oiling machine according to claim 1, wherein: the oil discharge pipe is also provided with an oil pump for pumping oil in the quantitative detection box to a designated position.
7. The automatic verification system for the oiling machine according to claim 1, wherein: 2-4 groups of air hammers are arranged on the outer wall of the oil passing pipe at intervals.
8. The automatic verification system for the oiling machine according to claim 1, wherein: the liquid level transport mechanism is provided with three diaphragm flanges with the same height at intervals, and each diaphragm flange is connected with the liquid level transmitter through an independent capillary tube.
CN202011521617.XA 2020-12-21 2020-12-21 Automatic verification system for oiling machine Pending CN112729482A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114689149A (en) * 2022-04-02 2022-07-01 四川楚林希科技有限公司 Intelligent calibrating device for fuel oiling machine

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480088A1 (en) * 1990-10-11 1992-04-15 Scheidt & Bachmann Gmbh Dispensing device for liquid fuels
EP0559925A1 (en) * 1992-03-07 1993-09-15 Scheidt & Bachmann Gmbh Method and device for the collection of residual fuel during testing and adjusting the function and measuring accurancy of a fuel dispenser
KR100940364B1 (en) * 2009-06-04 2010-02-04 서화경 Apparatus and method for preventing mixed oil
CN201762088U (en) * 2010-08-24 2011-03-16 杭州市质量技术监督检测院 Multi-point quick automatic detection device of fuel adding machine
CN105675318A (en) * 2015-12-28 2016-06-15 江苏大学 Automatic calibrating device for fuel dispenser, leveling method and liquid level image identification method thereof
CN205317311U (en) * 2016-01-27 2016-06-15 重庆市计量质量检测研究院 Automatic calibrating installation of tanker aircraft
CN107462306A (en) * 2017-08-29 2017-12-12 福建省计量科学研究院 A kind of fuel charger automatic calibrator
CN107505028A (en) * 2017-10-19 2017-12-22 朱敏 A kind of fuel charger automatic calibrating instrument
CN109915440A (en) * 2019-04-09 2019-06-21 贵州电网有限责任公司 A kind of the hydraulic oil off gas system and method for hydraulic mechanism
CN111912491A (en) * 2020-09-07 2020-11-10 陕西大秦环境科技有限公司 Liquid level measuring device for pressure container

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480088A1 (en) * 1990-10-11 1992-04-15 Scheidt & Bachmann Gmbh Dispensing device for liquid fuels
EP0559925A1 (en) * 1992-03-07 1993-09-15 Scheidt & Bachmann Gmbh Method and device for the collection of residual fuel during testing and adjusting the function and measuring accurancy of a fuel dispenser
KR100940364B1 (en) * 2009-06-04 2010-02-04 서화경 Apparatus and method for preventing mixed oil
CN201762088U (en) * 2010-08-24 2011-03-16 杭州市质量技术监督检测院 Multi-point quick automatic detection device of fuel adding machine
CN105675318A (en) * 2015-12-28 2016-06-15 江苏大学 Automatic calibrating device for fuel dispenser, leveling method and liquid level image identification method thereof
CN205317311U (en) * 2016-01-27 2016-06-15 重庆市计量质量检测研究院 Automatic calibrating installation of tanker aircraft
CN107462306A (en) * 2017-08-29 2017-12-12 福建省计量科学研究院 A kind of fuel charger automatic calibrator
CN107505028A (en) * 2017-10-19 2017-12-22 朱敏 A kind of fuel charger automatic calibrating instrument
CN109915440A (en) * 2019-04-09 2019-06-21 贵州电网有限责任公司 A kind of the hydraulic oil off gas system and method for hydraulic mechanism
CN111912491A (en) * 2020-09-07 2020-11-10 陕西大秦环境科技有限公司 Liquid level measuring device for pressure container

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114689149A (en) * 2022-04-02 2022-07-01 四川楚林希科技有限公司 Intelligent calibrating device for fuel oiling machine

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